Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6b73354ec1502a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 23:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26af3609fd78108eca395758e71bac21 SHA-1: e66445bd93fee1c7de7922b50a3f177772566baa SHA-256: 3d6b73354ec1502a280d19a7d5459c975d3a775a67ab1089cf416c1f9c5f92d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=data+kualitatif+dan+kuantitatif+pdf PDF link annotation
    • https://bank-kredit.at/ckfinder/userfiles/files/vufowelodebosal.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lagepidugolux.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/warololatawevuvikuxutodof.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7bbba003d5fc80e99a69df658c3391af/96016107424.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/97262647693.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcafa073a6---62298957522.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/jelez.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aa7a3dbbccb7df1070ea6957d7fb1332/wusexo.pdfIn PDF document text
    • http://raczcsalad.hu/files/sesena.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/34719351992.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611371d84a88f---14702692768.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/59686430258.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2da816bb35---19647042476.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160882ac49ede8---mesetukumifa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/89541544a3683ffdedca0c190a52267a/72203778709.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/fejadarawezuluwage.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce24a1bd6d---27207242283.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jesalulejupomomazisuzudod.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/juxixawepebisofetaxo.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/motiju.pdfIn PDF document text
    • http://guowangcable.com/d/files/kagisudobube.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/mamanovesisomikawelet.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/59391007533.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/51504767945.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10164 bytes
SHA-256: 832ded2aeae9a528129e506ff61e8efcaaa8b426b14b0002d650b5350a937e0b
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 17628 bytes
SHA-256: 1682f448102f0253966e872715576ce48715fe1360032835236b7fab3e7c1c06
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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